1. The Mariana Trench has a narrow, semi-circular shape. It is about 2,550 km (1,580 mi) long and only 69 km (43 mi) wide!
2. If you drown Mount Everest – at the Mariana Trench, its peak would still be over 2 km (1,25 mi) below the sea surface.
3. The pressure at the bottom of the Mariana is about 1000 times that of the atmospheric pressure at sea level.
4. The Mariana is considered to be one of the world’s coldest places. Its average temperature is about 39°F or 4°C.
5. The ocean floor of the Mariana has a yellowish color because of the decaying animal remains, shells, skeletons, and rotting plants.
6. Surprisingly but, even the Mariana Trench is now full of garbage, man-made chemicals, tons of toxic pollutants, as well as uncountable pieces of metal wreckage.
7. It has even been proposed as a site for nuclear waste disposal in the hope that the tectonic plate subduction occurring there might draw the nuclear waste down into the Earth’s mantle.
8. The absolute lack of sunlight means no algae or plants, so the deep-sea animals survive mainly on dead organisms, which continuously sink to the bottom.
9. The first people to dive into the Mariana Trench were Don Walsh (U.S. naval officer), and Jacques Piccard (Swiss ocean engineer). They reached Challenger Deep floor aboard the Bathyscaphe Trieste in 1960.
10. In 2009, the Mariana Trench was established as an American National Monument.
11. The next person to dive into the Mariana Trench was the Canadian filmmaker James Cameron. He did so more than 50 years after the first descent – in 2012.
12. The deepest place on earth is part of the so-called Hadal zone, named after the realm of Hades, the ancient Greek god of the underworld and the souls of the dead.
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